/Engine/Source/Runtime/Core/Public/Math/TransformNonVectorized.h
DeltaAtom = Blend(Identity, SourceAtom, BlendWeight) FinalAtom.Rotation = DeltaAtom.Rotation * FinalAtom.Rotation FinalAtom.Translation += DeltaAtom.Translation FinalAtom.Scale3D *= DeltaAtom.Scale3D
static void BlendFromIdentityAndAccumulate ( [TTransform](API\Runtime\Core\Math\TTransform)< T > & FinalAtom, const [TTransform](API\Runtime\Core\Math\TTransform)< T > & SourceAtom, float BlendWeight )